text: /********************************************************************************
  *  This file is part of CinoLib                                                 *
  *  Copyright(C) 2016: Marco Livesu                                              *
  *                                                                               *
  *  The MIT License                                                              *
  *                                                                               *
  *  Permission is hereby granted, free of charge, to any person obtaining a      *
  *  copy of this software and associated documentation files (the "Software"),   *
  *  to deal in the Software without restriction, including without limitation    *
  *  the rights to use, copy, modify, merge, publish, distribute, sublicense,     *
  *  and/or sell copies of the Software, and to permit persons to whom the        *
  *  Software is furnished to do so, subject to the following conditions:         *
  *                                                                               *
  *  The above copyright notice and this permission notice shall be included in   *
  *  all copies or substantial portions of the Software.                          *
  *                                                                               *
  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR   *
  *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,     *
  *  FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE *
  *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER       *
  *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING      *
  *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS *
  *  IN THE SOFTWARE.                                                             *
  *                                                                               *
  *  Author(s):                                                                   *
  *                                                                               *
  *     Marco Livesu (marco.livesu@gmail.com)                                     *
  *     http://pers.ge.imati.cnr.it/livesu/                                       *
  *                                                                               *
  *     Italian National Research Council (CNR)                                   *
  *     Institute for Applied Mathematics and Information Technologies (IMATI)    *
  *     Via de Marini, 6                                                          *
  *     16149 Genoa,                                                              *
  *     Italy                                                                     *
  *********************************************************************************/
  #ifndef CINO_VERTEX_MASS_H
  #define CINO_VERTEX_MASS_H
  
  #include <cinolib/meshes/abstract_mesh.h>
  #include <Eigen/Sparse>
  
  namespace cinolib
  {
  
  template<class M, class V, class E, class P>
  CINO_INLINE
  Eigen::SparseMatrix<double> mass_matrix(const AbstractMesh<M,V,E,P> & m,
                                          const int n = 1); // diagonally replicate mass matrix n times:
                                                            //
                                                            //  n=1      n=2        n=3
                                                            //  | M |   | M 0 |   | M 0 0 |
                                                            //          | 0 M |   | 0 M 0 |
                                                            //                    | 0 0 M |
  
  }
  
  #include "vertex_mass.tpp"
  
  #endif // CINO_VERTEX_MASS_H
  